There is a four storeyed house in the neighbourhood of Rohan and Amit which has two types of staircases in it. One is a normal, stanting type staircase which is inside the house and the other one is a spiral type (vertical) staircase at the back side of the house. Both the staircases lead from the ground floor to the roof of the house. Rohan and Amit are both students of class IX in different schools. Incidently, they are both of the same weight. Rohan said that a person using slanting staircase inside the house would do more work aganist a certain 'natural force' in goind from ground floor to the roof of the house (because the distance moved by the persin in using the slanting staircase is more). Rohan also said that the work done by the same person aganist the same natural force in going from ground floor to roof of the house would be less by using the spiral type (vertical) staircase (because the distance moved by him in this case will be less). Amit, however, did not agree with Rohan. Amit said that whether this person uses slanting staircase or spiral type (vertical) staircase, work done by him aganist the natural force in goind from ground floor to roof of the house would be the same. Rohan then decided to go from the ground floor to the roof top by slanting staircase and tool 90 seconds for doing this job. On the other hand, Amit went from ground floor to the roof top by spiral type (vertical) staircase and took 2 minutes for this job.
(a) Name the natural force aganist which work has to be done in going from ground floor to the roof top of the house.
(b) What supplies energy for doing work when Rohan and Amit climb up to the roof of the house?
(c) Whose statement about the amount of work doen aganist the natural force in going from ground floor to roof top is correct and why?
(d) Who has more power in terms of physics in climbing to roof top: Rohan or Amit? Why?
(e) What value are displayed by Amit in this episode?

Explanation

(a) The force of gravity.
(b) Food supplies the chemical energy for doing work.
(c) Amit's statement about the amount of work done against gravity in going from ground floor to roof top is correct. This is because when the work is done against gravity, then the distance moved by the person is the 'vertical distance' through which the person lifts himself aganist gravity. And the vertical distance moved up by a person in going from ground floor to roof top of the house is the same whether he uses slanting staircase or spiral type staircase. Due to this, the work doen by the person aganist gravity in both the case is the same.
(d) Rohan does the work of going from ground floor to roof top in 90 seconds whereas Amit does the same amount of work in 2 minutes or `2 xx 60 = 120` seconds. Since Rohan takes lesser time (of 90 seconds) to do the same work, so the rate of doing work (or power) of Rohan is more than that of Amit.
(e) The values displayed by Amit in this episode are (i) Awareness of the force of gravity (ii) Correct knowledge of the work done aganist gravity, and (iii) Application of knowledge in solving everyday problems.